The narrative begins with Akira being approached by a mysterious client who hires him to investigate a cold case from fifteen years ago—a case that involves Emiko's family. The case was about the sudden disappearance of Emiko's younger sister, Yumi, during a family outing to a rural town. Despite the police efforts, no trace of Yumi was ever found, and the case remained unsolved.

As Akira digs deeper into the past, he encounters numerous obstacles and dead ends. However, his investigation leads him to cross paths with Emiko, who is initially resistant to the idea of rehashing the past. Akira's determination and the peculiar details he uncovers persuade her to collaborate, hoping that together, they might find closure or, at the very least, some truth.

Keigo Higashino's style often blends elements of mystery, psychological insights, and a deep exploration of human nature, frequently with a twist that upends the reader's expectations. Here's a draft for a full feature inspired by his works:

Psychological Thriller/Mystery